Cool female ninja code name?

I'm writing a story and my character has a ninja code name. She has piercing Jade green eyes, and will wear either a light pink or dark blue kimono. She has long, black hair. Here are some names I have: Midnight, Raven, Snake, Viper, Lotus, Lynx, Cobra, Aurora, Miasma, Shadow, Pandora, Eclipse, Emerald, Moon. Please give me a suggestion or tell me which one I should choose and why!!!